Office (i.e., if the gateway interfaces with Signaling System 7 Strictly speaking, however, a trunk is a single DS0īetween two PSTN end offices however, for the purposes of thisĭocument, the PSTN interface of a gateway acts effectively as an end
(in North America), it has become common to refer to bundles of DS0sĪs a trunk. In the allocation of DS0s between end offices in minimum groups of 24
Since the introduction of ubiquitous digital trunking, which resulted
OTG DTG SIP DEFINITION SERIES
Transmission also operates using the DS series as a base multiple. Transmission rate of 64 kbps (the bandwidth normally used for one Of standard digital transmission rates based on DS0, a Trunk group can be shared across multiple switches for redundancyĭigital Signal 0 (DS0): Digital Signal X is a term for a series Systems in which all of the paths are interchangeable. The establishment of connections within or between switching
Trunk Group: A set of trunks, traffic engineered as a unit, for Terminations in the same switching system. In selected applications, it may have both its Switching systems used in the establishment of an end-to-endĬonnection. Trunk: In a network, a communication path connecting two Indication for the previous and next TDM switch participating inįormally, we define a trunk and trunk group and related terminologyĪs follows (definition of "trunk" and "trunk group" is from ). Same target switch or network is called a "trunk group".Ĭonsequently, trunk groups have labels, which are used as the main In switches, a group of trunks that connect to the Referred to as "trunks") between Time Division Multiplexed (TDM)Ĭircuit switches. BackgroundĬall routing in the Public Switched Telephone Network (PSTN) isĪccomplished by routing calls over specific circuits (commonly RFC 4904 Trunk Groups in tel/sip URIs June 2007 1. Normative Behavior of SIP Entities Using Trunk Groups. Trunk Group Identifier: ABNF and Examples. Originating Trunk Group and Terminating Trunk Group. RFC 4904 Trunk Groups in tel/sip URIs June 2007ġ. Group parameters in sip and tel Uniform Resource Identifiers (URIs).Īn extension to the tel URI is defined for this purpose. This document describes a standardized mechanism to convey trunk Official Protocol Standards" (STD 1) for the standardization stateĪnd status of this protocol. Please refer to the current edition of the "Internet Internet community, and requests discussion and suggestions for This document specifies an Internet standards track protocol for the Representing Trunk Groups in tel/sip Uniform Resource Identifiers (URIs) DTA is the oldest thermoanalytical method.Request for Comments: 4904 Bell Laboratories, Alcatel-Lucent The area under a DTA peak is the enthalpy change and is not affected by the heat capacity of the sample. Thus, a DTA curve provides data on the transformations that have occurred, such as glass transitions, crystallization, melting and sublimation. Changes in the sample, either exothermic or endothermic, can be detected relative to the inert reference. This differential temperature is then plotted against time, or against temperature (DTA curve, or thermogram). Here, the material under study & an inert reference are made to undergo identical thermal cycles, (i.e., same cooling or heating program) while recording any temperature difference between sample and reference. DTA is a technique in which the temperature difference between a substance and a thermally inert reference material is measured as a function of the temperature (T), while the substance and reference material are subjected to a controlled temperature program. DTA is a thermoanalytic technique that is similar to differential scanning calorimetry (DSC).
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